[e2e] TCP out of order

[Dennis Ferguson]

> this is classic with silly window syndrome, and there are specific 
> mechanisms in TCP implementations to avoid that. In short, TCP doesn't send 
> partial segments unless triggered in some way, such as no longer having 
> anything outstanding (Nagle's algorithm) or getting an API "push" event.

Ah, yes, I actually knew that but I'm getting old and forgetful.  I once
understood a circumstance where such packets were generated consistently,
since we had a situation where the behaviour was repeatable, but I've
forgotten that as well and was reduced to guessing.

Dennis Ferguson